ABSTRACT

The flame retardant natural rubber (NR) composites were prepared using carboxyl modified multi-walled carbon nanotubes (CMCNTs) and traditional intumescent flame retardant with the ratio among ammonium polyphosphate (APP), melamine (MEL), and pentaerythritol (PER) of 3/1/1. The flame retardancy and thermal stability, and mechanical properties of NR composites were investigated by the LOI test, UL-94 test, cone calorimeter test (CCT), thermogravimetric analysis (TGA), and tensile test, respectively. The results showed that NR/IFR3/2.0CMCNT had good flame retardancy and past the UL-94 test V-2 rating. The peak of heat release rate (pHRR), the peak of smoke production rate (pSPR), and the total smoke production (TSP) of NR/IFR3/2.0CMCNT were lower than those of NR/IFR3, which were reduced by 4.4%, 12.1%, and 26.3%, respectively. In addition, CMCNTs can improve the elongation at the break of NR composites with the increase of CMCNTs under the condition of low load CMCNTs.

摘要

采用羧基改性多壁碳纳米管 (CMCNTs) 和传统膨胀型阻燃剂制备阻燃天然橡胶 (NR) 复合材料，聚磷酸铵 (APP)、三聚氰胺 (MEL) 和季戊四醇 (PER) 的比例为 3/ 1/1。分别通过LOI测试、UL-94测试、锥形量热仪测试（CCT）、热重分析（TGA）和拉伸测试研究了NR复合材料的阻燃性和热稳定性以及力学性能。结果表明，NR/IFR3/2.0CMCNT具有良好的阻燃性，通过了UL-94测试V-2等级。NR/IFR3/2.0CMCNT的放热率峰值（pHRR）、发烟率峰值（pSPR）和总发烟量（TSP）均低于NR/IFR3，降低了4.4% ，分别为 12.1% 和 26.3%。此外，